Hi Annette, thank you for responding. I am new to this Bernina and its feet. It seems like there are 3 difference sets of numbers for Bernina feet. I have the original list of feet and attachments to my 1971 730. Those numbers do not appear to be any of the 3 other types of numbers I've found. I keep reading, searching for articles, etc that might possibily help me in my quest for more knowledge on my machine. Thanks again, Libber